Shape-shifting flock of birds darkens sky

http://archive.hometownlife.com/VideoNetwork/2949813594001/Shape-shifting-flock-of-birds-darkens-skyhttp://bc_gvpc_od-f.akamaihd.net/media/963482463001/201312/2453/963482463001_2949792627001_2c426d3e-7b63-42a4-823c-6a292da6a19c.mp4?pubId=44692039001&videoId=2949813594001http://archive.hometownlife.com/VideoNetwork/2949813594001/Shape-shifting-flock-of-birds-darkens-skyhttp://bc_gvpc.edgesuite.net/img/963482463001/201312/3341/963482463001_2949630948001_thumbnail-for-video-2949785514001.jpgShape-shifting flock of birds darkens skyCheck out this swarm of birds flying over Sacramento, California. The birds fly clustered together and change shapes as they move.3sacramentovpcseenhave you seenvpcbirdsflockwater coolerKXTVCaliforniavpcbestskyflyNational Newsviraloffbeat00:30